Pitching temporary plugging setting position prediction method and device

Abstract

The invention discloses a pitching temporary plugging setting position prediction method and device, and the method comprises the steps: obtaining critical condition data which needs to be satisfied when a temporary plugging ball enters a shot hole based on obtained actual measurement data; based on the critical condition data, a setting area where the temporary plugging ball can enter the shot hole is determined; obtaining a real-time shot hole split ratio of the to-be-measured shot hole based on the obtained real-time flow of the to-be-measured shot hole and the real-time flow in an upstream shaft of the to-be-measured shot hole; based on the real-time flow and the real-time shot hole split ratio, flow condition coordinates of the to-be-measured shot hole are obtained; whether the flow condition coordinates are within the range of the setting area or not is judged; if yes, determining that the temporary plugging ball forms setting in the to-be-detected shot hole; and if not, taking a downstream shot hole adjacent to the to-be-detected shot hole as a new to-be-detected shot hole, and re-executing the process of determining the flow condition coordinates and judging. And the setting behavior of the temporary plugging ball on the to-be-tested shot hole and the plugging sequence of the temporary plugging ball on the to-be-tested shot hole can be accurately evaluated.

Description

Technical Field

[0001] This invention relates to the field of oil fracturing technology, and in particular to a method and apparatus for predicting the location of temporary plugging and sealing by ball-throwing. Background Technology

[0002] With the large-scale development of unconventional oil and gas reservoirs, the application of temporary plugging and diversion fracturing technology is gradually expanding. This technology primarily involves adding various types of temporary plugging agents during fracturing operations to partially seal the perforations, thereby promoting the opening and propagation of new fractures, increasing fracture complexity, and ultimately boosting oil and gas production. However, the lack of effective methods for predicting the specific sealing location of the added temporary plugging balls hinders the effectiveness of this technique. Summary of the Invention

[0003] To accurately assess the setting behavior of a ball temporarily blocking a borehole, this invention provides a method and apparatus for predicting the setting position of a ball temporarily blocking a borehole.

[0004] In a first aspect, embodiments of the present invention provide a method for predicting the temporary blocking position of a pitch, including:

[0005] Based on the obtained measured data, the critical conditions that the temporary blocking ball must meet to enter the blast hole were obtained.

[0006] Based on the critical condition data, the setting area of ​​the temporary plugging ball that can enter the blast hole is determined;

[0007] Based on the real-time flow rate of the borehole under test and the real-time flow rate in the upstream wellbore of the borehole under test, the real-time borehole flow split ratio of the borehole under test is calculated.

[0008] Based on the real-time flow rate and the real-time borehole split ratio, the flow condition coordinates of the borehole under test are obtained.

[0009] Determine whether the flow condition coordinates are within the range of the sealing area;

[0010] If so, then it is determined that the temporary plugging ball forms a set seal in the borehole to be tested;

[0011] If not, then the downstream blast hole adjacent to the blast hole to be tested will be taken as the new blast hole to be tested, and the above process of determining the flow condition coordinates and making judgments will be repeated.

[0012] Optionally, the critical condition data includes minimum injection rate, maximum injection rate, minimum borehole split ratio, and critical injection rate.

[0013] Based on the acquired measured data, the critical conditions that the temporary plugging ball must meet to enter the blast hole are obtained, including:

[0014] The measured data shall be obtained; the measured data shall include at least the wellbore inner diameter, borehole angle, borehole spacing, viscosity of the liquid in the wellbore, density of the liquid in the wellbore, and pumping discharge range.

[0015] An indoor experimental device is constructed, comprising a simulated well shaft and simulated blast holes located within the simulated well shaft. The inner diameter of the simulated well shaft is the same as that of the well shaft, and the angle and spacing of the simulated blast holes are the same as those of the blast holes.

[0016] Based on the aforementioned indoor experimental setup, using the viscosity of the liquid inside the wellbore, the density of the liquid inside the wellbore, and the range of pumping flow rates as experimental conditions, the minimum pumping flow rate, the maximum pumping flow rate, the minimum borehole split ratio, and the critical pumping flow rate were obtained.

[0017] Optionally, the critical condition data includes minimum injection rate, maximum injection rate, minimum borehole split ratio, and critical injection rate.

[0018] Based on the acquired measured data, the critical conditions that the temporary plugging ball must meet to enter the blast hole are obtained, including:

[0019] The measured data includes the wellbore inner diameter, borehole angle, borehole spacing, viscosity of the liquid inside the wellbore, density of the liquid inside the wellbore, density of the temporary plugging ball, particle size of the temporary plugging ball, and pumping flow rate range.

[0020] A geometric model is constructed based on the wellbore inner diameter, the borehole angle, and the borehole spacing.

[0021] Input the viscosity of the liquid inside the wellbore, the density of the liquid inside the wellbore, the density of the temporary plugging ball, and the particle size of the temporary plugging ball into the geometric model to define the boundary conditions;

[0022] A mathematical model of the geometric model is established to obtain a calculation model. The pumping displacement range is input into the calculation model to calculate the minimum pumping displacement, maximum pumping displacement, minimum borehole split ratio, and critical pumping displacement.

[0023] Optionally, determining the setting area where the temporary plugging ball can enter the borehole based on the critical condition data includes:

[0024] A first coordinate system is established with the borehole flow rate as the horizontal axis and the borehole flow splitting ratio as the vertical axis.

[0025] Using the minimum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the first data point are obtained;

[0026] The coordinates of the second data point are obtained by using the product of the critical pumping flow rate and the minimum borehole flow ratio as the x-axis and the minimum borehole flow ratio as the y-axis.

[0027] Using the maximum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the third data point are obtained;

[0028] The enclosed area is obtained based on the region enclosed by the first data point, the second data point, and the third data point.

[0029] Optionally, determining the setting area where the temporary plugging ball can enter the borehole based on the critical condition data includes:

[0030] A second coordinate system is established with the upstream flow rate of the blast hole as the horizontal axis and the flow splitting ratio of the blast hole as the vertical axis.

[0031] Using the minimum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the fourth data point are obtained;

[0032] Using the critical pumping displacement as the x-axis and the minimum borehole flow split ratio as the y-axis, the coordinates of the fifth data point are obtained;

[0033] Using the maximum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the sixth data point are obtained;

[0034] The sealing area is obtained based on the area enclosed by the fourth, fifth, and sixth data points.

[0035] Optionally, the step of calculating the real-time flow split ratio of the blast hole under test based on the acquired real-time flow rate of the blast hole and the real-time flow rate in the upstream shaft of the blast hole under test includes:

[0036] Obtain the real-time flow rate of the borehole under test and the real-time flow rate in the upstream shaft of the borehole under test;

[0037] The real-time flow split ratio of the blast hole under test is obtained by comparing the real-time flow rate of the blast hole under test with the real-time flow rate in the upstream wellbore of the blast hole under test.

[0038] Secondly, embodiments of the present invention also provide a device for predicting the temporary blocking position of a pitch, comprising:

[0039] The acquisition module is used to obtain the critical conditions that the temporary blocking ball must meet to enter the blast hole based on the acquired measured data;

[0040] The processing module is used to determine the setting area where the temporary plugging ball can enter the blast hole based on the critical condition data;

[0041] The calculation module is used to calculate the real-time flow split ratio of the blast hole under test based on the real-time flow rate of the blast hole under test and the real-time flow rate in the upstream wellbore of the blast hole under test.

[0042] The analysis module is used to obtain the flow condition coordinates of the borehole under test based on the real-time flow rate and the real-time borehole split ratio.

[0043] The judgment module is used to determine whether the flow condition coordinates are within the range of the sealing area;

[0044] The determination module is used to determine that if the flow condition coordinates are within the range of the setting area, the temporary plugging ball forms a setting in the borehole to be tested; otherwise, the downstream borehole adjacent to the borehole to be tested is taken as a new borehole to be tested, and the calculation module, analysis module and judgment module re-execute the above process of determining the flow condition coordinates and making judgments.

[0045] Thirdly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the pitching temporary blocking position prediction method as described in the first aspect.

[0046] Fourthly, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the pitching block position prediction method as described in the first aspect.

[0047] Fifthly, embodiments of the present invention also provide a computer program product containing instructions that, when the computer program product is run on a computer device, cause the computer device to execute the pitching temporary blocking position prediction method as described in the first aspect.

[0048] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0049] This invention provides a method for predicting the setting position of a temporary plugging ball. Based on measured data, a setting region is established. Using the obtained flow condition coordinates of the borehole to be tested, the method determines whether the temporary plugging ball has formed a setting in the borehole by judging whether the flow condition coordinates fall within the setting region. This method allows for individual setting behavior judgment for each borehole through which the temporary plugging ball flows. Furthermore, this method is applicable to situations where multiple temporary plugging balls are added to the wellbore at once, accurately determining the setting position of each ball and the blocking sequence of the balls in the boreholes to be tested.

[0050] In this method, the measured data includes wellbore inner diameter, borehole angle, borehole spacing, viscosity of the fluid in the wellbore, density of the fluid in the wellbore, density of the temporary plugging ball, particle size of the temporary plugging ball, and pumping flow rate range. It comprehensively considers the influence of wellbore and borehole parameters, fluid performance parameters, temporary plugging ball performance parameters, and construction parameters on the temporary plugging ball, making the method consistent with the actual physical movement process of the temporary plugging ball and able to accurately evaluate the setting behavior of the temporary plugging ball in the borehole under test.

[0051] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0052] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0053] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0054] Figure 1 This is a flowchart illustrating the method for predicting the temporary blocking position of a throw provided in an embodiment of the present invention.

[0055] Figure 2 This is a schematic diagram of the geometric model provided in an embodiment of the present invention;

[0056] Figure 3 This is a schematic diagram of the first coordinate system and the positioning region within the first coordinate system provided in an embodiment of the present invention;

[0057] Figure 4 This is a schematic diagram of the second coordinate system and the positioning region within the second coordinate system provided in an embodiment of the present invention;

[0058] Figure 5 This is a schematic diagram of the ball-throwing temporary blocking position prediction device provided in an embodiment of the present invention. Detailed Implementation

[0059] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] The inventors discovered that existing methods for determining the setting of temporary plugging balls have some significant problems: First, existing methods ignore the influence of the borehole angle. In particular, when multiple boreholes in a horizontal well are distributed at different angles around the well, the setting efficiency of the temporary plugging ball on each borehole is not equal. Therefore, existing methods cannot accurately assess the setting behavior of the temporary plugging ball on the borehole. Second, existing methods can only roughly determine the likelihood of the temporary plugging ball setting the borehole, but cannot specify which borehole the temporary plugging ball has entered. For multiple temporary plugging balls added at once, the sealing sequence of the temporary plugging balls on the borehole cannot be indicated.

[0063] To address the aforementioned issues, the inventors proposed a method and device for predicting the location of a ball that temporarily blocks a blast hole, in order to accurately determine the blocking behavior of the ball on the blast hole and to clarify the blast hole into which the ball enters and the blocking sequence of the ball on the blast hole.

[0064] Example 1

[0065] This application proposes a method for predicting the temporary blocking position of a pitch, see below. Figure 1 Specifically, it includes the following steps:

[0066] Step S1: Based on the acquired measured data, obtain the critical conditions that the temporary blocking ball must meet to enter the blast hole.

[0067] Step S2: Based on critical condition data, determine the sealing area where the temporary plugging ball can enter the blast hole.

[0068] Step S3: Based on the real-time flow rate of the blast hole to be tested and the real-time flow rate in the upstream wellbore of the blast hole to be tested, calculate the real-time blast hole diversion ratio of the blast hole to be tested.

[0069] Step S4: Based on the real-time flow rate and the real-time borehole split ratio, obtain the flow condition coordinates of the borehole to be tested.

[0070] Step S5: Determine whether the flow condition coordinates are within the range of the sealing area; if yes, proceed to step S6; if no, proceed to step S7.

[0071] Step S6: Determine that the temporary blocking ball sets up a seal in the borehole to be tested;

[0072] Step S7: Take the downstream blast hole adjacent to the blast hole to be tested as the new blast hole to be tested, and repeat the above process of determining the flow condition coordinates and making judgments, that is, repeat steps S3-S5.

[0073] To provide a clearer explanation of the above method for predicting the temporary blocking position of a pitch, the following section provides a detailed explanation of each step.

[0074] In step S1 above, the measured data includes four categories: ① Wellbore and borehole parameters: wellbore inner diameter, borehole angle, and borehole spacing. Here, the wellbore contains multiple boreholes, the borehole angle includes the angles corresponding to multiple boreholes, and the borehole spacing is the distance between each borehole and its adjacent borehole; ② Liquid performance parameters: viscosity and density of the liquid in the wellbore; ③ Temporary plugging ball performance parameters: density and particle size of the temporary plugging ball; ④ Construction parameters: pumping flow rate range. It is worth noting that the pumping flow rate range includes multiple pumping flow rates, and at least includes the minimum and maximum pumping flow rates. These pumping flow rates are obtained in real time by monitoring the temporary plugging ball in the wellbore. Here, existing flow meters or flow sensors can be used to detect the flow rate in real time as the pumping flow rate.

[0075] Critical condition data include minimum pumping flow rate (Qmin), maximum pumping flow rate (Qmax), minimum borehole split ratio (Rmin), and critical pumping flow rate (Qc). The definitions of these four critical condition data are as follows:

[0076] The minimum pumping displacement (Qmin) is the minimum pumping displacement that the temporary plugging ball can enter the blast hole.

[0077] The maximum pumping displacement (Qmax) is the maximum pumping displacement that the temporary plugging ball can enter the blast hole.

[0078] The minimum borehole diversion ratio (Rmin) is the minimum borehole diversion ratio that the temporary plugging ball can enter. The borehole diversion ratio is the ratio of the flow rate in the borehole to the flow rate in the upstream wellbore.

[0079] The critical pumping displacement (Qc) is the pumping displacement at which the temporary plugging ball can enter the borehole and set under the minimum borehole split ratio.

[0080] In this embodiment, critical condition data can be obtained through indoor experiments and numerical simulations.

[0081] In the first method, the specific steps for obtaining critical condition data using indoor experimental methods may include:

[0082] Step S101: Obtain the measured data.

[0083] Step S102: Construct an indoor experimental device. The indoor experimental device includes a simulated well shaft and simulated blast holes set inside the simulated well shaft. The inner diameter of the simulated well shaft is the same as the inner diameter of the well shaft mentioned above, and the angle and spacing of the simulated blast holes are the same as the angle and spacing of the blast holes mentioned above, respectively.

[0084] In step S102 above, when setting up the indoor experimental device, it should be noted that the number of simulated blast holes is consistent with the number of blast holes, and the angle of each simulated blast hole is consistent with the angle of the corresponding blast hole. The distance between each simulated blast hole and the adjacent simulated blast hole should be consistent with the distance between the corresponding blast holes, so as to restore the actual well shaft structure and blast hole distribution, and make the simulation results more accurate.

[0085] Step S103: Based on the indoor experimental setup, using the viscosity of the liquid in the wellbore, the density of the liquid in the wellbore, and the range of pumping flow rates as experimental conditions, the minimum pumping flow rate, the maximum pumping flow rate, the minimum borehole split ratio, and the critical pumping flow rate are obtained.

[0086] In step S103, to ensure that the indoor experimental device can reproduce the movement process of the temporary plugging ball in the actual wellbore, the experimental conditions of the indoor experimental device should be consistent with the relevant measured data, that is, the viscosity, density, and pumping displacement range of the liquid in the wellbore should be used as the experimental conditions. The viscosity and density of the simulated liquid in the indoor experimental device are consistent with the viscosity and density of the liquid in the wellbore mentioned above, respectively, and the actual pumping displacement range of the indoor experimental device is consistent with the pumping displacement range mentioned above. A flow meter or flow sensor or other device capable of monitoring flow rate is installed in the indoor experimental device to monitor the flow rate in the simulated wellbore and the actual pumping displacement in real time. The flow rate in the simulated wellbore needs to focus on the flow rate of the simulated blast hole and the flow rate in the simulated wellbore upstream of the simulated blast hole. It is worth noting that both the actual pumping displacement and the flow rate in the simulated wellbore are recorded in real time, and the recording time interval is consistent for ease of statistical calculation.

[0087] The temporary plugging ball and simulated liquid are injected into the indoor experimental setup. The actual pumping rate starts from the minimum pumping rate and is gradually increased (not exceeding the maximum pumping rate), with real-time recording. This continues until the plugging ball begins to move and enters the simulated blast hole; the pumping rate at this point is recorded as the minimum pumping rate. The pumping rate is continuously increased until the plugging ball is just flushed away; the pumping rate at the critical state where the plugging ball begins to move but has not yet been flushed away is recorded as the maximum pumping rate. Based on the measured flow rate of the simulated blast hole to the flow rate in the upstream simulated wellbore, the real-time blast hole split ratio is calculated. Combining this real-time blast hole split ratio, the minimum real-time blast hole split ratio corresponding to the simulated blast hole into which the plugging ball can enter is obtained; this is recorded as the minimum blast hole split ratio. Based on the real-time recorded actual pumping flow rate, the actual pumping flow rate corresponding to the temporary plugging ball being able to enter the simulated blast hole setting under the above minimum blast hole split ratio is obtained, which is taken as the critical pumping flow rate.

[0088] In the second method, the specific steps for obtaining critical condition data using numerical simulation may include:

[0089] Step S111: Obtain the measured data.

[0090] Step S112: Construct a geometric model based on the wellbore inner diameter, borehole angle, and borehole spacing.

[0091] In step S112, refer to Figure 2 Using existing numerical simulation software, the inner diameter of the well shaft is input to establish a simulated well shaft P1. Then, the borehole angle and borehole spacing are input, and a simulated borehole P2 is set inside the simulated well shaft to finally obtain the geometric model.

[0092] Step S113: Input the viscosity of the liquid inside the wellbore, the density of the liquid inside the wellbore, the density of the temporary plugging ball, and the particle size of the temporary plugging ball into the geometric model to define the boundary conditions.

[0093] In step S113, the boundary conditions involve at least the parameters of the simulated plugging ball and the parameters of the simulated liquid. Specifically, the process of defining the boundary conditions is as follows: input the viscosity and density of the liquid inside the wellbore into the geometric model to obtain the parameters of the simulated liquid; input the density and particle size of the plugging ball into the geometric model to obtain the parameters of the simulated plugging ball.

[0094] Step S114: Establish the mathematical model of the geometric model to obtain the calculation model. Input the pumping displacement range into the calculation model to calculate the minimum pumping displacement, maximum pumping displacement, minimum borehole split ratio, and critical pumping displacement.

[0095] In step S114, the mathematical model includes at least fluid dynamics equations and the motion equations of the simulated plugging ball: fluid dynamics equations such as the Navier-Stokes equations can be used to describe the flow of the simulated fluid within the simulated wellbore, and the flow rate within the simulated wellbore can be calculated in real time using these fluid dynamics equations; the motion equations of the simulated plugging ball can be established based on Newton's second law. The mathematical model is established by inputting the above equations into the geometric model, resulting in the computational model.

[0096] Input the pumping displacement range into the calculation model, and gradually increase the pumping displacement (not exceeding the maximum pumping displacement) at the minimum pumping displacement until the simulated temporary plugging ball begins to move and enters the simulated blast hole. Record the pumping displacement at this point as the minimum pumping displacement. Continue to increase the pumping displacement until the simulated temporary plugging ball is washed away. Record the pumping displacement at the critical state between the simulated blast hole and its removal as the maximum pumping displacement.

[0097] Based on the calculation results of the simulated wellbore flow rate, the flow rate of the simulated blast hole and the flow rate of the simulated wellbore upstream of the simulated blast hole are extracted. The ratio of the two is used as the blast hole flow split ratio. The value of the blast hole flow split ratio is adjusted until the minimum value of the blast hole flow split ratio corresponding to the simulated temporary plug ball being able to enter the simulated blast hole is found, which is used as the minimum blast hole flow split ratio.

[0098] Under the aforementioned minimum borehole flow ratio, the pumping discharge rate corresponding to the time when the simulated temporary plugging ball can enter the simulated borehole for setting is obtained, which is taken as the critical pumping discharge rate.

[0099] In this embodiment, during the process of obtaining critical condition data using numerical simulation, the flow rate at each simulated borehole at each moment can be obtained through numerical simulation software. This allows for the accurate calculation of the borehole split ratio for the corresponding simulated borehole, thus providing a new algorithm for determining the setting position of the temporary plugging ball in numerical simulation of temporary plugging diversion fracturing. This method can also provide theoretical guidance for the design of temporary plugging diversion fracturing, study the factors affecting the setting effect of the temporary plugging ball, calculate the effect of temporary plugging diversion fracturing under different construction conditions, and provide theoretical guidance for on-site construction decisions.

[0100] In step S2 above, based on critical condition data, the following two methods are used to determine the setting area where the temporary plugging ball can enter the blast hole.

[0101] See Figure 3 The first method for determining the enclosure area includes the following specific steps:

[0102] Step S201: Establish a first coordinate system with the borehole flow rate as the horizontal axis and the borehole flow splitting ratio as the vertical axis.

[0103] Step S202: Using the minimum pumping displacement as the x-axis and the value 1 as the y-axis, obtain the coordinates of the first data point, i.e. Figure 3 The coordinates of point A in the diagram.

[0104] Step S203: Using the product of the critical pumping flow rate and the minimum borehole flow ratio as the x-axis and the minimum borehole flow ratio as the y-axis, obtain the coordinates of the second data point, i.e. Figure 3 The coordinates of point B in the diagram.

[0105] Step S204: Using the maximum pumping displacement as the x-axis and the value 1 as the y-axis, obtain the coordinates of the third data point, i.e. Figure 3 The coordinates of point C in the diagram.

[0106] Step S205: Based on the area enclosed by the first data point, the second data point, and the third data point, the enclosed area is obtained.

[0107] In step S205, the region enclosed by points A, B, and C is designated as the constitutive region S, which is formed by three lines: line L1 between points A and C, curve L2 between points A and B, and curve L3 between points B and C. Curves L2 and L3 can be generated using Hermite interpolation, and the equations of curves L2 and L3 are both concave functions.

[0108] See Figure 4 The second method for determining the enclosure area includes the following specific steps:

[0109] Step S211: Establish a second coordinate system with the upstream flow rate of the blast hole as the horizontal axis and the flow splitting ratio of the blast hole as the vertical axis.

[0110] Step S212: Using the minimum pumping displacement as the x-axis and the value 1 as the y-axis, obtain the coordinates of the fourth data point, i.e. Figure 4 The coordinates of point A in the diagram.

[0111] Step S213: Using the critical pumping displacement as the x-axis and the minimum borehole flow split ratio as the y-axis, obtain the coordinates of the fifth data point, i.e. Figure 4 The coordinates of point B in the diagram.

[0112] Step S214: Using the maximum pumping displacement as the x-axis and the value 1 as the y-axis, obtain the coordinates of the sixth data point, i.e. Figure 4 The coordinates of point C in the diagram.

[0113] Step S215: Based on the area enclosed by the fourth data point, the fifth data point, and the sixth data point, the enclosed area is obtained.

[0114] In step S215, the region enclosed by points A, B, and C is designated as the constitutive region S, which is formed by three lines: line L1 between points A and C, curve L2 between points A and B, and curve L3 between points B and C. Curves L2 and L3 can be generated using Hermite interpolation, and the equations of curves L2 and L3 are both concave functions.

[0115] In step S3 above, the calculation process of the real-time flow split ratio of the blast hole to be tested may specifically include: step S301, obtaining the real-time flow rate of the blast hole to be tested and the real-time flow rate in the upstream wellbore of the blast hole to be tested.

[0116] In step S301, refer to Figure 2 When the temporary plugging ball flows through a test blast hole, it is necessary to determine the real-time flow rate (Q) of that test blast hole during construction. perf ) and the real-time flow rate (Q) in the upstream wellbore of the borehole to be tested. up ), can utilize existing flow meters or flow sensors to detect flow in real time, thereby obtaining the real-time flow rate (Q) of the borehole under test. perf ) and the real-time flow rate (Q) in the upstream shaft of the blast hole to be tested up ).

[0117] Step S302: Using formula (1), based on the real-time flow rate (Q) of the borehole under test... perf ) and the real-time flow rate (Q) in the upstream shaft of the blast hole to be tested up The ratio of the two values ​​is used to obtain the real-time borehole split ratio (R) of the borehole under test. perf ):

[0118] R perf =Q perf / Q up (1)

[0119] In step S4 above, the real-time flow (Q) perf The x-axis represents the real-time borehole split ratio (R). perf Using y as the ordinate, we obtain the flow condition coordinates of the borehole P to be tested.

[0120] In step S5 above, it is determined whether the flow condition coordinates are within the range of the sealing area, that is, the determination point P(Q) is determined. perf R perf Whether it is located within the sealing area S obtained in step S2.

[0121] If so, proceed to step S6 to determine that the temporary blocking ball has formed a set seal in the hole to be fired.

[0122] If not, proceed to step S7, taking the downstream blast hole adjacent to the blast hole to be tested as the new blast hole to be tested, and re-execute the above process of determining the flow condition coordinates and making judgments, that is, re-execute steps S3-S5.

[0123] The method of this embodiment is also applicable to the case where multiple temporary plugging balls are added into the wellbore at one time. The performance parameters of each temporary plugging ball are obtained, including the density and particle size of the temporary plugging ball. Steps S1-S7 are executed one by one for each temporary plugging ball to accurately determine the setting position of each temporary plugging ball and the plugging sequence of the borehole to be tested.

[0124] The inventors discovered that existing technologies for judging ball-sealing performance mostly rely on force calculations as the ball passes through various perforation clusters. Patent CN111639434A discloses an optimized method for ball-sealing diversion fracturing in shale gas horizontal wells. This method uses a ball-sealing setting factor to assess the feasibility of ball-sealing. The setting factor is the ratio of the drag force to the inertial force experienced by the ball as it moves near the perforation. When this ratio is greater than 1, the ball is considered to have set on the perforation. The relevant theory behind this method has been reported in several publications, such as "Factors Influencing Optimum Ball Sealer Performance," "Experimental and Field Data Analyses of Ball-Sealer Diversion," and "Study on the Sealing Effect of Ball-Sealer in Shale Gas Horizontal Well Fracturing Construction," representing a mainstream method for judging ball-sealing performance. While these methods can assess the ball-sealing behavior on the perforation, their accuracy is low because they ignore the influence of the perforation angle. In this embodiment, the influence of wellbore and borehole parameters, fluid performance parameters, temporary plugging ball performance parameters, and construction parameters on the temporary plugging ball is comprehensively considered, and a method for determining the setting position of the temporary plugging ball is established. This method conforms to the actual physical movement process of the temporary plugging ball and can more accurately evaluate the setting behavior of the temporary plugging ball in the borehole under test compared with the prior art.

[0125] The inventors also discovered that patent CN113836753A discloses an optimization method for temporarily plugging and redirecting balls between perforations in horizontal well sections. In this method, the settling of the ball is determined based on whether the attraction of the perforation hole to the temporary plugging ball is greater than the maximum inertial force of the ball itself. If so, the temporary plugging ball is set in the perforation hole; otherwise, it cannot be set. This method can only roughly determine the likelihood of the temporary plugging ball setting in the perforation hole, but it cannot specify which perforation hole the ball has entered. Furthermore, it cannot indicate the sealing sequence of multiple temporary plugging balls added at once. In this embodiment, the setting behavior of each perforation hole through which the temporary plugging ball flows can be judged individually, thereby accurately determining the setting position of the temporary plugging ball. Moreover, for the case of multiple temporary plugging balls added at once in the wellbore, this embodiment can also determine the setting position of each temporary plugging ball and the sealing sequence of the perforation hole to be tested.

[0126] The method in this embodiment is applicable to any well type and has wide applicability.

[0127] Example 2

[0128] Based on the same inventive concept, see [reference] Figure 5 This application also proposes a device for predicting the temporary blocking position of a pitch, comprising:

[0129] The acquisition module 101 is used to obtain the critical conditions that the temporary blocking ball must meet to enter the blast hole based on the acquired measured data.

[0130] Processing module 102 is used to determine the setting area of ​​the temporary plugging ball that can enter the blast hole based on critical condition data;

[0131] The calculation module 103 is used to calculate the real-time flow split ratio of the blast hole under test based on the real-time flow rate of the blast hole under test and the real-time flow rate in the upstream well barrel of the blast hole under test.

[0132] Analysis module 104 is used to obtain the flow condition coordinates of the borehole under test based on real-time flow rate and real-time borehole split ratio;

[0133] The judgment module 105 is used to determine whether the flow condition coordinates are within the range of the sealing area;

[0134] The determination module 106 is used to determine that if the flow condition coordinates are within the settling area, the temporary plugging ball will form a settling in the borehole to be tested; otherwise, the downstream borehole adjacent to the borehole to be tested will be taken as the new borehole to be tested, and the calculation module 103, analysis module 104 and judgment module 105 will re-execute the above process of determining the flow condition coordinates and making judgments.

[0135] The ball-throwing temporary blocking position prediction device provided in this embodiment of the invention has a similar implementation principle and technical effect to that of Embodiment 1, and will not be described again here.

[0136] Example 3

[0137] Based on the same inventive concept, this application also proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the pitching temporary blocking position prediction method as described in Embodiment 1.

[0138] The computer-readable storage medium may be included in the device / apparatus described in the above embodiments; or it may exist independently and not assembled into the device / apparatus. The computer-readable storage medium carries one or more programs, which, when executed, implement the method according to Embodiment 1 of the present invention.

[0139] According to embodiments of the present invention, the computer-readable storage medium may be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In the present invention, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0140] Example 4

[0141] Based on the same inventive concept, this application also proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the pitching temporary blocking position prediction method as described in Embodiment 1.

[0142] Example 5

[0143] Based on the same inventive concept, this application proposes a computer program product containing instructions. When the computer program product is run on a computer device, it causes the computer device to execute the pitching temporary blocking position prediction method in Embodiment 1.

[0144] The principles by which the above-mentioned devices, clients, media, and related equipment in this embodiment of the invention solve the problem are similar to those of the aforementioned methods. Therefore, their implementation can refer to the implementation of the aforementioned methods, and repeated details will not be repeated.

[0145] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0146] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0147] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0148] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0149] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A method for predicting the position of a temporary block during a pitch, characterized in that, include: Based on the obtained measured data, the critical conditions that the temporary blocking ball must meet to enter the blast hole were obtained. Based on the critical condition data, the setting area of ​​the temporary plugging ball that can enter the blast hole is determined; Based on the real-time flow rate of the borehole under test and the real-time flow rate in the upstream wellbore of the borehole under test, the real-time borehole flow split ratio of the borehole under test is calculated. Based on the real-time flow rate and the real-time borehole split ratio, the flow condition coordinates of the borehole under test are obtained. Determine whether the flow condition coordinates are within the range of the sealing area; If so, then it is determined that the temporary plugging ball forms a set seal in the borehole to be tested; If not, then the downstream blast hole adjacent to the blast hole to be tested will be taken as the new blast hole to be tested, and the above process of determining the flow condition coordinates and making judgments will be repeated.

2. The method for predicting the temporary blocking position of a throw as described in claim 1, characterized in that, The critical condition data includes minimum pumping flow rate, maximum pumping flow rate, minimum borehole split ratio, and critical pumping flow rate; Based on the acquired measured data, the critical conditions that the temporary plugging ball must meet to enter the blast hole are obtained, including: The measured data shall be obtained; the measured data shall include at least the wellbore inner diameter, borehole angle, borehole spacing, viscosity of the liquid in the wellbore, density of the liquid in the wellbore, and pumping discharge range. An indoor experimental device is constructed, comprising a simulated well shaft and simulated blast holes located within the simulated well shaft. The inner diameter of the simulated well shaft is the same as that of the well shaft, and the angle and spacing of the simulated blast holes are the same as those of the blast holes. Based on the indoor experimental setup, using the viscosity of the liquid inside the wellbore, the density of the liquid inside the wellbore, and the range of pumping discharge rates as experimental conditions, the minimum pumping discharge rate, the maximum pumping discharge rate, the minimum borehole split ratio, and the critical pumping discharge rate were obtained.

3. The method for predicting the temporary blocking position of a pitch as described in claim 1, characterized in that, The critical condition data includes minimum pumping flow rate, maximum pumping flow rate, minimum borehole split ratio, and critical pumping flow rate; Based on the acquired measured data, the critical conditions that the temporary plugging ball must meet to enter the blast hole are obtained, including: The measured data includes the wellbore inner diameter, borehole angle, borehole spacing, viscosity of the liquid inside the wellbore, density of the liquid inside the wellbore, density of the temporary plugging ball, particle size of the temporary plugging ball, and pumping flow rate range. A geometric model is constructed based on the wellbore inner diameter, the borehole angle, and the borehole spacing. Input the viscosity of the liquid inside the wellbore, the density of the liquid inside the wellbore, the density of the temporary plugging ball, and the particle size of the temporary plugging ball into the geometric model to define the boundary conditions; A mathematical model of the geometric model is established to obtain a calculation model. The pumping displacement range is input into the calculation model to calculate the minimum pumping displacement, maximum pumping displacement, minimum borehole split ratio, and critical pumping displacement.

4. The method for predicting the temporary blocking position of a throw as described in claim 2 or 3, characterized in that, The determination of the setting area where the temporary plugging ball can enter the blast hole based on the critical condition data includes: A first coordinate system is established with the borehole flow rate as the horizontal axis and the borehole flow splitting ratio as the vertical axis. Using the minimum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the first data point are obtained; The coordinates of the second data point are obtained by using the product of the critical pumping flow rate and the minimum borehole flow ratio as the x-axis and the minimum borehole flow ratio as the y-axis. Using the maximum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the third data point are obtained; The enclosed area is obtained based on the region enclosed by the first data point, the second data point, and the third data point.

5. The method for predicting the temporary blocking position of a throw as described in claim 2 or 3, characterized in that, The determination of the setting area where the temporary plugging ball can enter the blast hole based on the critical condition data includes: A second coordinate system is established with the upstream flow rate of the blast hole as the horizontal axis and the flow splitting ratio of the blast hole as the vertical axis. Using the minimum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the fourth data point are obtained; Using the critical pumping displacement as the x-axis and the minimum borehole flow split ratio as the y-axis, the coordinates of the fifth data point are obtained; Using the maximum pumping displacement as the x-axis and the value 1 as the y-axis, the coordinates of the sixth data point are obtained; The sealing area is obtained based on the area enclosed by the fourth, fifth, and sixth data points.

6. The method for predicting the temporary blocking position of a pitch as described in claim 1, characterized in that, The calculation of the real-time flow split ratio of the test blast hole based on the acquired real-time flow rate of the test blast hole and the real-time flow rate in the upstream shaft of the test blast hole includes: Obtain the real-time flow rate of the borehole under test and the real-time flow rate in the upstream shaft of the borehole under test; The real-time flow split ratio of the blast hole under test is obtained by comparing the real-time flow rate of the blast hole under test with the real-time flow rate in the upstream wellbore of the blast hole under test.

7. A device for predicting the position of a ball being temporarily blocked during a throw, characterized in that, include: The acquisition module is used to obtain the critical conditions that the temporary blocking ball must meet to enter the blast hole based on the acquired measured data; The processing module is used to determine the setting area where the temporary plugging ball can enter the blast hole based on the critical condition data; The calculation module is used to calculate the real-time flow split ratio of the blast hole under test based on the real-time flow rate of the blast hole under test and the real-time flow rate in the upstream wellbore of the blast hole under test. The analysis module is used to obtain the flow condition coordinates of the borehole under test based on the real-time flow rate and the real-time borehole split ratio. The judgment module is used to determine whether the flow condition coordinates are within the range of the sealing area; The determination module is used to determine that if the flow condition coordinates are within the range of the setting area, the temporary plugging ball forms a setting in the borehole to be tested; otherwise, the downstream borehole adjacent to the borehole to be tested is taken as a new borehole to be tested, and the calculation module, analysis module and judgment module re-execute the above process of determining the flow condition coordinates and making judgments.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the pitching temporary blocking position prediction method as described in any one of claims 1-6.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the pitching temporary block position prediction method as described in any one of claims 1-6.

10. A computer program product containing instructions that, when run on a computer device, causes the computer device to perform the pitching block position prediction method as described in any one of claims 1-6.

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